[3.7] bpo-34282: Fix Enum._convert method shadowing members named _convert (GH-9034)

* Fix Enum._convert shadowing members named _convert
diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index ef2d1da..4b17228 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -1516,6 +1516,23 @@
             yellow = 6
         self.assertEqual(MoreColor.magenta.hex(), '5 hexlified!')
 
+    def test_subclass_duplicate_name(self):
+        class Base(Enum):
+            def test(self):
+                pass
+        class Test(Base):
+            test = 1
+        self.assertIs(type(Test.test), Test)
+
+    def test_subclass_duplicate_name_dynamic(self):
+        from types import DynamicClassAttribute
+        class Base(Enum):
+            @DynamicClassAttribute
+            def test(self):
+                return 'dynamic'
+        class Test(Base):
+            test = 1
+        self.assertEqual(Test.test.test, 'dynamic')
 
     def test_no_duplicates(self):
         class UniqueEnum(Enum):